Summary
Overview
Work History
Education
Skills
Certification
Technical Skills
Personal Information
Timeline
Generic
Sinson Varghese

Sinson Varghese

Thrissur

Summary

Dynamic Senior Network Engineer with proven expertise at CallTek Inc., specializing in enterprise network design and SD-WAN deployment. Adept at mentoring teams and optimizing network infrastructures, achieving 100% GPNS compliance while enhancing troubleshooting workflows. Skilled in FortiGate firewalls and committed to delivering exceptional technical support and strategic solutions.

Overview

1
1
Certification
12
12
years of professional experience

Work History

Senior Network Engineer

CallTek Inc.
12.2022 - Current
  • Project: Cloud5 Communications
  • Lead end-to-end remote network engineering infrastructure design and senior technical support across large-scale enterprise hospitality portfolios, ensuring strict adherence to global brand standards.
  • Function as senior engineering authority for NOC, managing and resolving complex tier 2 escalations through advanced root-cause analysis.
  • Facilitate mentorship and guidance for junior technical team members to enhance remote troubleshooting workflows and decrease mean time to resolution (MTTR).
  • Established optimized, and sustained robust network infrastructures for premium Marriott properties globally, ensuring 100% adherence to stringent GPNS standards.
  • Utilized centralized cloud platforms (Ruckus VSZ, Aruba Central, Meraki Dashboard) to implement zero-touch provisioning and manage remote configurations for over 100 global nodes without physical access.
  • Implemented and administered enterprise SD-WAN environments utilizing FortiGate and Velocloud orchestrator to establish intelligent traffic steering, link redundancy, and sub-second failover.
  • Constructed secure site-to-site and remote access VPN tunnels (IPSec/SSL) for reliable connectivity between property networks and centralized data centers.
  • Engineered dedicated secure vendor networks to isolate third-party hospitality systems (IoT smart-room tech, IPTV, CCTV) from core guest and admin networks, mitigating corporate security risks.
  • Orchestrated high-profile conference network builds, provisioning custom bandwidth limits, dedicated VLANs, and tailored captive portals for corporate events.
  • Directed real-time incident resolution, conducting root-cause analysis, and ensuring strict SLA compliance utilizing ServiceNow and Salesforce.
  • Led seamless integration of network routing with hospitality property management systems (PMS), including Opera, Fosse, and Galaxy across full-service hotel properties.
  • Evaluated and enhanced network performance to fully comply with 110s operational frameworks.

Network and System Administrator

Valappila Communications
01.2018 - 01.2022
  • Managed and optimized core switching and routing environments utilizing multi-vendor hardware, including Cisco and HP enterprise switches.
  • Administered localized network systems, ensuring high availability of critical infrastructure protocols, including DNS, DHCP, and centralized server virtualizations.
  • Migrated legacy, outdated network setups into modern, high-availability, segmented topologies, drastically reducing operational network overhead.

System Administrator

IndiaOptions
01.2015 - 01.2017
  • Managed enterprise system deployments, user access controls, Active Directory services, and corporate endpoint security policies.
  • Maintained internal corporate network systems, troubleshooting and resolving day-to-day hardware, software, and localized connectivity issues.

Field Engineer

TCC
01.2014 - 01.2015
  • Executed hardware deployments, structured cabling, rack installations, and baseline configurations of networking equipment to ensure readiness for operational use.
  • Conducted wireless RF surveys and validation testing to ensure optimal signal strength and coverage in deployment zones.

Education

B.Sc. - Computer Science

Annamalai University

3-Year Diploma - Computer Networking

Technical Board of Kerala

Skills

  • Enterprise Network Design
  • Network Architecture
  • Fortigate SD-WAN
  • Fortigate firewall
  • Ruckus vSZ/ZD
  • Aruba Central
  • Cisco Meraki Dashboard
  • Velocloud Orchestrator
  • Wireless Network Management
  • Cisco Switches
  • Site-to-Site VPN
  • Firewall high availability
  • Load Balancing
  • Traffic Steering
  • HTTPS
  • DNS
  • DHCP Scope Management
  • TCP/IP
  • VLAN Routing
  • IPAM
  • Network Firmware Upgrades
  • Captive portal configuration
  • Conference Network Builds
  • WatchGuard
  • SolarWinds
  • IT Service Management
  • Tier 2 Escalation Management
  • Customer Relationship Management
  • HP Wireless Conductors
  • Nomadix AP Replacement

Certification

  • CCNP Enterprise – Cisco Certified Network Professional
  • CCNA – Cisco Certified Network Associate
  • RSZA – Ruckus SmartZone Administrator
  • RICXI – Ruckus ICX Implementer

Technical Skills

Marriott GPNS (Global Property Network Standards), 110S Frameworks, Ruckus vSZ/ZD, Aruba Central, Cisco Meraki Dashboard, HP Wireless Conductors, Fortigate SD-WAN, Velocloud Orchestrator, Site-to-Site VPN (IPSec/SSL), Firewall HA Clusters (Active-Active/Active-Passive), Load Balancing, Traffic Steering, Fortinet Fortigate, WatchGuard, Nomadix Gateways, Cisco Switches, Vendor Isolation, HTTPS, DNS, DHCP Scope Management, TCP/IP, VLAN Routing, IPAM, Conference Network Builds, Bandwidth Allocation, Captive Portal Customization, Tier 2 Escalation Management, Network Firmware Upgrades, Nomadix AP Replacement, SolarWinds, Helios, ServiceNow, Salesforce

Personal Information

Available: Permanent Remote & Flexible/Global Shifts

Timeline

Senior Network Engineer

CallTek Inc.
12.2022 - Current

Network and System Administrator

Valappila Communications
01.2018 - 01.2022

System Administrator

IndiaOptions
01.2015 - 01.2017

Field Engineer

TCC
01.2014 - 01.2015

B.Sc. - Computer Science

Annamalai University

3-Year Diploma - Computer Networking

Technical Board of Kerala
Sinson Varghese